Stayed in the apartment for almost 3 months during my summer internship and immediately felt at home. Grant's studio is super cozy, clean, well designed with awesome views and facilities. The studio is small but very functional with a great pool and gym on the 5th floor. The pull out couch is surprisingly comfortable and slept like a baby during my 3 months.
Just a few stops away to hip neighbourhoods in sukhmvit with cool bars and cafes (asok/thonglor). It is relatively long commute to business district (Silom/Bangrak) ~45 min by BTS- something to keep in mind if your here for business and don't like long commutes. That being said- BTS is steps away from the apartment which is very convenient especially when it rains. Street food is abundant and awesome (ate at the market almost every night), and there is a nice mini shopping center across the street called udomone when your looking for international cuisine or cafes.
Grant is also an awesome host, very friendly and was super responsive whenever anything arose (a lot can happen during a summer in Bangkok). In fact, I had an accident within my first few hours of checking in and Grant quickly figured out how to get me to the nearest hospital and handled the situation perfectly. You'll be in good hands!